Improvement in balanced slide-valves



R. G. BISHOP. Balanced Slide-Valve,

No. -20l,l5 1. Patented March 1.2, 1878'.

wmmssts: INVENTOR:

/ ATTORNEYS.

N.PETEflS. PHOTO-LITHOGRAPHER, WASHINGTON, D C.

I'm-man STATES PATENT OFFICE.

RUFUS (En-BISHOP, OF OHETOPAH, KANSAS.-

IMPROVEMENT IN BALANCED SLIDE-VALVES.

Specification forming part of Letters Patent No. 201,151, dated March12, 187B application filcd January 2, 1878.

To all whom it may concern:

Be it known that I, Burns G. Brsnor, of Ghetopah, in the county ofLabette and State of Kansas, have invented a new and Improved BalancedSlide-Valve, of which the following is a specification:

In the accompanying drawings, Figure 1' represents a horizontal sectionof my improved balanced slide-valve on line a: .00, Fig. 2. Figs. 2 and3 are vertical longitudinal and transverse sections of r the same,respectively, on lines 3 3 Fig. 1, and c c, Fig. 2.

Similar letters of reference indicate corresponding parts.

This invention has reference to an improved balanced slide-valve ofsimple and durable construction, that is not liable to wear out andleak, and can be used with advantage on any steam-engine.

The invention consists of a center chest cast on the cylinder, and ofside chests secured thereto. At both ends of the center box are lateralchambers, opening by ports into the cylinder, for inducting and eductingthe steam, the lateral ports opening alsosidewise into the side chests,in which two slidevalves, that are connected by transverse screwbolts,are reciprocated.

The center chest communicates, by large exhaust-openings, with theslide-valves and cylinder, and is exhausted through the lid of thechests, the steam entering through a raised top or branched pipe to theside chests.

Referring to the drawings, A represents the center chest, which ispreferably cast in one piece with the cylinder; and B, the side chests,which are firmly bolted thereto by means of transverse bolts a, passingthrough the ends of the side chests.

' The center and side chests are closed by a tightly-fitted lid, 0,screwed over the same.

The outer surfaces of the side walls of the chests.

The side chests are connected with the engine by transverse chambers bat both ends of the main chest, that open into the cylinder,

and communicate, also, by side ports b, with the side chests. The sidechests communicate through the end chambers b and arched or scoopedparts of the slide-valves D, with the center chest A, which has largeexhaust-openings d.

The slide-valves G are laterally connected by screw-bolts e, and workedjointly by the eccentric-rod E, connected to the eccentric. The valves,being hung together, are perfectly balanced, as their surfaces arealike.

The steam enters into the side chests either by a raised box or top, f,and side openings of lid, or by a pipe branching out to the sideopenings of the lid, so as to induct the steam simultaneously to bothside chests. The steam is exhausted through a port, g, in the centerpart of the lid.

The slide-valves are more or less tightly pressed on their seats by theconnecting-bolts, the inner and outer nuts of which at the ends admitthe adjustment of the valves on the seats.

The eccentric-rod is attached in suitable manner to the screw-bolts, andguided in a thimble or tube, h, passing around the rod through the endchamber 1). The rod needs no packing, as only exhaust-steam is aroundthe rod, the live steam being prevented from escaping by theguide-thimble.

The stay-rods of the valves work in the exhaust-openings of the chests,and are not in the way, the arched parts of the valves being made longto correspond to the long exhaustopenings.

The entrance-ports to the cylinder are short, so that the steam isconducted to the piston directly without crooked passages. The wear ofthe valves will be even and the running of the same easy, as the valvesare perfectly bal anced, the steam being inducted at one end through oneof the end chambers and ports, and exhausted freely through the port andchamber at the other end, and through the large exhaust-openings of thecenter chest to the outside.

Having thus described my invention, I claim as new and desire to secureby Letters Patent The combination of "a center chest, having transverseend chamber, with bottom and side ports of side chests applied tightlyto both sides of the center chests, and of laterallyconnected andbalanced slide-valves, moving along outer seats of the center chest, 01conducting the steam from top openings of the side chests and endchambers to the cylinder, and exhausting the same through the sideopenings of the end chambers of the center chest, and exhaust-openingsof the center chest, substantially in the manner and for the purposespecified.

RUFUS G. BISHOP. "Witnesses:

A. G. DRAKE, D. M. BENDER.

